Before you can add the Google Chrome icon to your desktop, make sure you have it installed on your computer. If you are certain that you have it installed, skip this section.

Click the gear icon (top right), then Accounts and Email accounts. Select Add account, then enter your Gmail email address. Click Continue, then follow the instructions to sign into your Google ...

For those who did not like new icons for Gmail, Calendar, Google Drive, etc. can follow this guide to revert back to old icons on Android, iOS & Chrome.

It appears as though Google is testing some tweaked icons within Gmail on desktop to closely mimic icons seen on the Android and iOS apps.